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A comment on What If Planet 9 Is a Primordial Black Hole?. Parent comment

Re:What If Planet 9 Is a Primordial Black Hole? by semi-extrinsic on Thursday September 26, 2019 @01:52PM (#21083451)
Ah, you're right.

So plugging in numbers you get 2.15 times the radius of Earth, which becomes 13 750 km.

For comparison, Earth-Moon distance is approx. 400 000 km.

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Re:What If Planet 9 Is a Primordial Black Hole? by perl4ever on Saturday September 28, 2019 @07:51PM (#21103909)
Yes, but you don't have to be within the Roche limit to have substantial tidal effects, which could destroy habitability at a much greater distance. Just look at Io.
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